v0 Security Checklist: 12-Item Guide Before Using Components

Q: What should I check in v0 generated code?

Review the generated dependencies for known vulnerabilities, check that user inputs are sanitized before rendering, verify no placeholder API keys exist, and ensure forms have proper validation.

TL;DR

v0 by Vercel generates React and Next.js UI components. Unlike full-stack generators, v0 focuses on frontend code. This 12-item checklist covers XSS vulnerabilities, dependency security, and input handling. 3 critical items must be fixed immediately, 5 important items before production, and 4 recommended items when you can.

Quick Checklist (5 Critical Items)

Search for placeholder secretsLook for YOUR_API_KEY, sk_test_, or placeholder values

Review dangerouslySetInnerHTML usageThis can execute arbitrary HTML/JS if not sanitized

Check for eval() or Function() callsThese can execute arbitrary code - avoid unless necessary

Run npm audit after installingCheck for known vulnerabilities in new dependencies

Verify form inputs are escapedUser input should never be rendered as raw HTML

Code Review 3

::checklist-item{label="Search for placeholder secrets" description="Look for "YOUR_API_KEY", "sk_test_", or other placeholder values that should be replaced. How to secure API keys"} ::

Review dangerouslySetInnerHTML usageIf the component uses dangerouslySetInnerHTML, verify the content is sanitized. How to prevent XSS

Check for eval() or Function() callsThese can execute arbitrary code. Avoid unless absolutely necessary. How to avoid eval()

Dependencies 3

Review added npm packagesCheck what packages the component requires. Research unfamiliar ones before installing. How to audit npm packages

Run npm audit after installingRun: npm audit to check for known vulnerabilities in dependencies. How to fix npm vulnerabilities

Verify package maintenance statusCheck npm for last publish date. Avoid packages not updated in 2+ years. How to evaluate packages

Input Handling 3

Verify form inputs are escapedUser input displayed on page should be escaped. React does this by default, but check custom rendering. How to escape user input

Check URL parameter handlingIf component reads from URL params, verify they are validated before use. How to validate URL params

Review file upload componentsIf uploading files, verify type restrictions and size limits are implemented. How to secure file uploads

Integration 3

Test with your CSP headersIf you have Content Security Policy headers, verify the component works without violations. How to configure CSP

Check for CORS requirementsIf component fetches external resources, verify your CORS configuration allows them. How to configure CORS

Verify no inline event handlers with user dataonClick handlers should not include unsanitized user data. How to secure event handlers

v0 Security Considerations

v0 differs from full-stack AI tools because it generates UI components, not complete applications. This means security concerns are focused on frontend issues: XSS vulnerabilities, unsafe dependency usage, and improper input handling.

The good news is that React (which v0 generates) escapes content by default, preventing most XSS attacks. The main risks come from using dangerouslySetInnerHTML, adding untrusted packages, or mishandling URL parameters and form inputs.

Is v0 safe for production components?

v0 generates React/Next.js components that are generally safe, but you should review them before production use. Check for proper input handling, secure dependencies, and ensure no placeholder secrets were left in the code. React's default escaping prevents most XSS, but custom rendering needs review.

What should I check in v0 generated code?

Review the generated dependencies for known vulnerabilities (npm audit), check that user inputs are not used with dangerouslySetInnerHTML, verify no placeholder API keys exist, and ensure forms have proper validation on both client and server.

Does v0 introduce backend security risks?

v0 generates frontend components, not backend code. However, if you connect v0 components to APIs, ensure those APIs have proper authentication, authorization, and input validation. The component is only as secure as the backend it connects to.

TL;DR

Quick Checklist (5 Critical Items)

Code Review 3

Dependencies 3

Input Handling 3

Integration 3

v0 Security Considerations

Is v0 safe for production components?

What should I check in v0 generated code?

Does v0 introduce backend security risks?

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v0 Security Checklist: 12-Item Guide Before Using Components